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ASM Handbook

Corrosion: Fundamentals, Testing, and Protection

Edited by
Stephen D. Cramer
Stephen D. Cramer
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Bernard S. Covino, Jr.
Bernard S. Covino, Jr.
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ASM International
Volume
13A
ISBN electronic:
978-1-62708-182-5
Publication date:
2003
Book Chapter

Effects of Metallurgical Variables on Dealloying Corrosion

By
Sean G. Corcoran
Sean G. Corcoran
Virginia Polytechnic Institute and State University
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Published:
2003
Page range:
287 - 293
Publication history
December 01, 2003

Abstract

Dealloying is a corrosion process in which one or more elements are selectively dissolved, leaving behind a porous residue of the remaining elements. This article describes the dealloying in various systems, namely, dezincification, graphitic corrosion, dealuminification, and noble metal alloys dealloying. The current-potential behavior of a binary alloy undergoing selective dissolution is reviewed. The article highlights the four mechanisms required for the formation of porous metals: ionization-redeposition, surface diffusion, volume diffusion, and percolation model of selective dissolution.

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Sean G. Corcoran, 2003. "Effects of Metallurgical Variables on Dealloying Corrosion", Corrosion: Fundamentals, Testing, and Protection, Stephen D. Cramer, Bernard S. Covino, Jr.

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